package com.demo.spring.cloud.gateway.filter;

import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * 全局过滤器用于TOKEN 校验
 * @author wangzhilong
 * @date 2019-06-14
 */
@Component
public class TokenGlobalFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        String token = exchange.getRequest().getQueryParams().getFirst("token");
        if (token == null || token.isEmpty()) {
            //设置状态直接返回授权失败结果
            exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
            return exchange.getResponse().setComplete();
        }
        //完成路由转发
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return -100;
    }
}
